Agreed. I didn't expect my post to go through ... I expected it to merely become a +1 on an already-posted link. That said, for some sites "www" and the domain

Agreed. I didn't expect my post to go through ... I expected it to merely become a +1 on an already-posted link. That said, for some sites "www" and the domain by itself serve different content and function as different sites, and it would be difficult to try to reliably figure out if it's the case for every submitted domain.